Added StringHelper::countWords() that given a string returns number of words in it

framework/CHANGELOG.md

@@ -27,6 +27,7 @@ Yii Framework 2 Change Log
 - Enh #10764: `yii\helpers\Html::tag()` and `::beginTag()` return content without any HTML when the `$tag` attribute is `false` or `null` (pana1990)
 - Enh #10941: Added `yii\helpers\ArrayHelper::isTraversable`, added support for traversable selections for dropdownList, radioList and checkboxList in `yii\helpers\Html` (sammousa)
 - Eng #10976: `Inflector::transliterate()` now uses `strtr` instead of `str_replace` (DrDeath72)
+- Enh: Added `StringHelper::countWords()` that given a string returns number of words in it (samdark)
 - Bug #11040: Check parameter 'recursive' and disable recursive copying with option 'recursive' => false in method BaseFileHelper::copyDirectory (Ni-san)
 - Chg: HTMLPurifier dependency updated to `~4.6` (samdark)
 - Chg #10726: Added `yii\rbac\ManagerInterface::canAddChild()` (dkhlystov, samdark)

framework/helpers/BaseStringHelper.php

@@ -270,4 +270,16 @@ class BaseStringHelper
         }
         return $result;
     }
+
+    /**
+     * Counts words in a string
+     * @since 2.0.8
+     *
+     * @param string $string
+     * @return integer
+     */
+    public static function countWords($string)
+    {
+        return count(preg_split('/\s+/u', $string, null, PREG_SPLIT_NO_EMPTY));
+    }
 }

tests/framework/helpers/StringHelperTest.php

@@ -240,4 +240,13 @@ class StringHelperTest extends TestCase
         $this->assertEquals(['It/', ' is?', ' a', ' test with rtrim'], StringHelper::explode("It/, is?, a , test with rtrim", ',', 'rtrim'));
         $this->assertEquals(['It', ' is', ' a ', ' test with closure'], StringHelper::explode("It/, is?, a , test with closure", ',', function ($value) { return trim($value, '/?'); }));
     }
+
+    public function testWordCount()
+    {
+        $this->assertEquals(3, StringHelper::countWords('china 中国 ㄍㄐㄋㄎㄌ'));
+        $this->assertEquals(4, StringHelper::countWords('и много тут слов?'));
+        $this->assertEquals(4, StringHelper::countWords("и\rмного\r\nтут\nслов?"));
+        $this->assertEquals(1, StringHelper::countWords('крем-брюле'));
+        $this->assertEquals(1, StringHelper::countWords(' слово '));
+    }
 }